256605706001 has 4 divisors (see below), whose sum is σ = 258959886900. Its totient is φ = 254251525104.

The previous prime is 256605705991. The next prime is 256605706013. The reversal of 256605706001 is 100607506652.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 94135444225 + 162470261776 = 306815^2 + 403076^2 .

It is a cyclic number.

It is not a de Polignac number, because 256605706001 - 2²² = 256601511697 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (256605706601) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1177090286 + ... + 1177090503.

It is an arithmetic number, because the mean of its divisors is an integer number (64739971725).

Almost surely, 2^256605706001 is an apocalyptic number.

It is an amenable number.

256605706001 is a deficient number, since it is larger than the sum of its proper divisors (2354180899).

256605706001 is a wasteful number, since it uses less digits than its factorization.

256605706001 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2354180898.

The product of its (nonzero) digits is 75600, while the sum is 38.

The spelling of 256605706001 in words is "two hundred fifty-six billion, six hundred five million, seven hundred six thousand, one".